Carburizing material and process of making same



Patented May 8, 1923.

LOUIS AEBY, or EAST CHICAGO, 'mnmna, assronon T cnrcaeo FLE IBLE SHAFT comrauxor onrcaeo, ILLINOISHA oonrona'rrou or ILLINOIS.

CARBURIZING MATERIAL AND PROCESS OF MAKING SAME.

No Drawing.

To all whom it may concern: Be it' known that I, LoUIs ABBY, a citizen of the United States, having residence in East Chicago, in the count}' of Lake and the State of Indiana, have invented certain new and useful Improvements in C'arburizing Materials and Processes of Making Same,'of which the following is aspecification, reference being had to the accompanying drawings, forming a part thereof.

The purpose ofthis invention is to provide an improved material for case ca rbu rizing and a process for making the same. It consists as to the'material in the combination of the substances intermixed and united asdescribed, and as to the process in the succession of steps as particularly set forth, all as indicated in the claims. a

In the carrying out of this invention Iv reduce charcoal to a. dust condition by any suitable pulverizing apparatus; and at any convenient stage in the process of such reduction, perferably before it is entirely complete,--that is, before the charcoal is all reduced. to a condition of dust, I intermix with the charcoal a suitable proortion of any convenient non-liquid energizer, as lime, soda-ash, sodium carbonate or barium carbonate, such energizers becoming reduced to a dust condition in the continuing process of mixing them with the charcoal while completing the process of reducing that material to dust. During the latter part of this process after the energizer is added to the charcoal, thereis added a limited quantity of coal tar, or other binder only enough when thoroughly intermixed during the closing'stage of the process of mixing the other elements to render the whole mass cohesive and moldable; and when the coal tar is thus thoroughly-in-v termixed', so as to render the entire mass cohesive, it is molded into briquttes'and baked to-dryness, primarily for the purpose of shrinking, at a temperature not sum-- Application filed February 11, 1921. Serial No. 444,145.

cient to fuse the energizer. These bri quettes may in'special cases where extended flat surfaces are to be case-hardened, be employed in their integral form; but 'in general, these briquettes are crushed by any convenient crushing and fr'agmentizing apparatus and the crushed material is screened to sort it into different sizes and. separate the dust which is too fine for desirable use incase carburizing. This dust is returned to the mixing apparatus and mixed with the pulverized charcoal in the subsequent bat'ches. In the continuous proc-.

'ess of manufacture, the quantity of dust returned from the crushed briquette, having of course a small quantity of coal tar, is substantially uniform so that variation in output from this cause is negligible.

'1 claim .3 1. The process of making carburizingmaterial which consists in the followin' steps; '(1) mechanically reducing charcoa to a condition of dust; (2) at a stage-in the process of such reduction to dust'mechanically thoroughly intermixing ivith the charcoal and energizer adapted to be it self reduced to a condition of dust in the process of mixing; (3) adding to the mixture at a stage in the process of mixing the charcoal and energizer and pulverizing the latter coal tar in a quantity to render the mixture coherent and 'moldabley (4) molding said coherent mixture into briquettes; (5) shrinking such briquettes by so baking them to dryness at a temperature less than adequate to fuse the energizer; (6) crus hingthe, briquettes and screening and sorting the crushed material to sizes.

-2."A carburizingmaterial consisting of. dried andfshrunken briquettes composed of charcoal and an energizer with a binder;

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 9th day-otFebruary', 1921.- 7

Louis I may. 

